AD/B747/250 Amdt 1 - Thrust Reverser (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B747/250 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Boeing 747 Series Aeroplanes

AD/B747/250 Amdt 1

Thrust Reverser 9/2002

Applicability: Boeing Model 747-400 series aeroplanes equipped with Pratt and Whitney PW4000 series engines.

Requirement: 1. a. Install an additional locking system on each engine thrust reverser in accordance with the instructions detailed in Boeing Service Bulletin (SB) 747-78-2155, Revision 2, dated 5 November 1998.

b. Modify the central maintenance computer system hardware and software in accordance with Boeing SB 747-45-2016, Revision 1, dated 2 May 1996.

c. Modify the integrated display system software in accordance with Boeing SB 747-31-2245, dated 27 June, 1996. d. Install the provisional wiring for the locking system on the thrust reverser in accordance with Boeing SB 747-78-2154, Revision 3, dated 11 December 1997.

2. Carry out a function test to detect discrepancies of the additional locking system on each engine thrust reverser, in accordance with Appendix 1 of FAA AD 2000- 12-21 Amendment 39-11799.